Bag



, v 1 Y F' N W" June 9,1959 y c.v. BRADY, "2,889,979

I BAG Filed Eeb. 13, 1957 3 Sheets-Sheet -1- June 9, 1959 c v BRADY 2,889,979

' BAG 3 Sheets-Sheet 2 'Filed Feb. 13, 1957 June 9, .1959 c; v, ADY 2,889,979

' I 'BAG a :s Sheets-Sheet 3 Filed Feb. 15, 1957 'Z 4,7 I I BM?) I L 119a 7/ 7 United States Patent 2,889,979 BAG 3 'Claims. (Cl. 229-625) V This invention relates to bags, and more particularly to pasted valve bags. 7

Among the several objects of the invention may be noted the provision of bags of the class described, and particularly multiwall paper valve bags ofthe type having pasted end closures, in which the valve is narrower than the width of the pasted closure at the valve end of the bag, this feature being particularly useful in a bag with a comparatively wide pasted closure; and the provision of bags of this character which are economical to manufacture. Other objects and features will be in part apparent and in part pointed out hereinafter.

The invention accordingly comprises the constructions hereinafter described, the scope of the invention being indicated in the following claims.

In the accompanying drawings, in whichseveral of various possible embodiments of the invention are illustrated,

Fig. 1 is a view of an end portion of a flat paper bag tube prepared for the formation of a pasted end closure with a valve in accordance with this invention;

Figs. 2, 3 and 4 are views showing steps in the formation of the pasted end closure;

Fig. 5 is a" view showing the completed pasted closure;

Fig. 6 is a view of one end of a flat paper bag tube prepared in a somewhat different manner from that shown in Fig. 1 [for theformation of a pasted end closure with a valve in accordance with this invention;

Fig. 7 is a view corresponding to Fig. Zishowing a I step in the formation of the end closure on the Fig. 6

tube; and,

Fig. 8 is a view corresponding to Fig. 5 showing the completed closure formed from the Fig. '6 tube.

Corresponding reference characters indicate corresponding parts throughout the several views of the drawmgs.

Referring to the drawings, 'Fig. 1 shows an end portion of aflat paper bag tube l'from which a bag of this invention is made. This'tube is usually a multiply tube. One wall of the tube is designated 3 and the other 5. The side edges of the flat tube are constituted by longitudinal fold lines 7 and 9. It will be understood that the tube has a pasted longitudinal seam. This has not been shown in the drawings to avoid unnecessary detail. Adjacent one corner of the tube (the right corner as shown in Fig. l) the tube walls 3 and 5 are provided with slits 11 and 13.

As shown in Fig. 2, a portion of the wall 3 of the tube is folded back on a transverse fold line 15 to form :an inturned triangular end flap 17 at the left corner (which is the valve corner) and an inturned end flap 19 at the right corner. The flap 17 is formed by fold- 'ing on lines 21 and 23 which extend from an apex 25 on the side edge 7 of the tube at the valve corner end of fold line 15 to points 27 and 29 on the end edge of the tube. The lines 21 and 23 lie at angles to the fold line 15. The end flap 19 is formed by folding on lines 31 and 33 which extend at 45 angles to line 15 from an apex 35 in the side edge 9 of the tube at the other end of line 15 to the inner ends of the slits 11 and 13 (which open up as shown in Fig. 2).

A stripe of paste is applied as indicated at P-1 in Fig. 2 extending [from adjacent the edge of wall 3 to adjacent the edge of wall 5 across the inner end portion: of end flap 19. A first side closure flap 37 is folded: in from the wall 3 of the tube on a transverse fold line: 39 to overlie a central portion 17a of the end flap 17" at the valve corner and a central portion 19a of the: other end flap 19. Folded over with the flap 37 at the valve corner of the bag is a triangular portion 17b of the end flap 17 (see Fig. 3). This triangular portion 17b, instead of being folded over on a line coincident with the transverse fold line 39, is folded over on a line 41 which extends inward from the valve corner end 43 of the transverse fold line 39 at an angle to line 39. A triangular portion 170 of the flap 17 is folded outward on a line 45 into the plane of the flap 37.

Paste is applied as indicated at P-2 to the folded-over flap 37, and a second side closure flap 47 is folded in from the wall 5 of the tube on a transverse fold line 49 to overlie the first side flap 37. Folded over with the flap 47 at the valve corner of the bag is a triangular portion 17d of the flap 17 (see Fig. 4). This triangular portion 17d, instead of being folded over on a line coincident with the transverse fold line 49, is folded over on a line 51 which extends inward from the valve corner end 53- of fold line 49 at an angle to line 49. A triangular portion 17e of flap- 17 is folded outward on a line 55 into the plane of the flap 47.

The completed folded and pasted closure (see Fig. 5) comprises the inturned end flaps 17 and 19, the first side flap 37 folded in from the wall 3 of the bag on the transverse fold line 39 and the second side flap 47 folded in from the wall 5 of the bag on the transverse fold line 49 and overlying the first side flap 37. At the valve corner of the. bag, triangular portions 17b and 17d of the end flap 17 are folded over with the side flaps 37 and 47 on the lines 41 and 51 which extend at am angle to the transverse fold lines 39 and 49 from the valve corner ends .43 and 53 of lines 39 and 49 and which converge toward one another from ends 43 and 53 of lines 39 and 49. Consequently, the inner end of the valve defined by the portions 17a, 17b and 17d of the flap 17 is narrower than the width of the end closure (i.e., the dimension of the closure between lines 39 and 49). This narrowing of the valve is particularly useful in the caseof bags with comparatively wide pasted end closures. The flaps 37 and 47 include the triangular portions 170 and 17e of flap 17.

A modification of the above, which may simplify the operation of applying the paste in the formation of the end closure, is illustrated in Figs. 6-8. As shown in Fig. 6, the tube corresponds to the tube shown in Fig. 1 and is designated 101. One wall of the tube is designated 103 and the other 105. The side edges of the tube are designated 107 and 109. The tube has slits 111 and 113 adjacent the corner opposite the valve corner corresponding to slits 11 and 13. In addition to these slits, the tube is provided with an additional slit 114 in the tube wall adjacent the valve corner. The end of the tube is opened up in much the same manner as shown in Fig. 2 by folding back a portion of the wall 103 on a transverse fold line 115 (corresponding to line 15) to form an inturned end flap 117 at the valve corner and an inturned end flap 119 at the right corner. The flap 117 is formed by folding on lines 121 and 123 which extend from an apex 125 on the side edge 107 of the tube at the valve corner end of fold line 115. Line 121 extends from apex 125 to a. point 127 on the end edge of the tube at an angle of- 45 to line 115. Line 123 extends from apex 125 at right Patented June 9, 1959' 3 angles to line 121 to theinner end of the slit 114 (which opens up as shown in Fig. 7). The end flap 119 corresponds exactly to the end flap 19 shown in Fig. 2.

Paste is applied in an L-shaped pattern as indicated at, P-3 in Fig. 7 extending across the inner end portion of end flap 119 and across the exposed portion of wall 105 of the tube. Additionally, a spot of paste P-4 is applied at the corner of end flap 117 adjacent the opened-up slit 114. A first side closure flap 137 (which corresponds to flap 37) is folded in from the wall 103 of the tube on a transverse fold line 139 to overlie a central portion 117a of the end flap 117 at the valve corner and a central portion 119a of the other end flap 119. Folded over with the flap 137 at the valve corner ofthe bag is a triangular portion 11712 of the end flap 117. This corresponds to portion 17b shown in Fig, 3, and, instead of being folded over on a line coincident with the transverse fold line 139, is folded over on a line 141 which extends inward from the valve corner end .143 of the line 139 at an angle to line 139. A triangular portion 1170 of the flap tends from the valve corner end 153 of fold line 149 at an angle to line 149. A small triangular portion 117e of flap 117 is folded outward on a line 155 into the plane of the flap 147. The resultant completed and folded pasted closure is shown in Fig. 8, and is similar to the closure shown in Fig. 5 in respect to the inner end of the valve defined by portions 117a, 117b and 117d of the flap 117 being narrower than the width of the end closure. The spot of paste P-4 pastes portion 117a to flap 137 (more particularly to the portion 1176 of flap 117 included in flap 137).

In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.

As various changes could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

I claim:

1. A paper valve bag having a folded and pasted closure'at one end thereof, one of the corners of the bag at said end thereof being a valve corner, the bag having a slit in one wall thereof at said valve corner, said closure being constituted by inturned end flaps, the one end flap at said valve corner being formed by folding the other wall of the bag on a line extending from an apex on the side edge of the bag to a point on the end edge of the bag and by folding said "one wall on a line extending from said apex to the inner end of the slit, a first side closure 4 flap folded in from the other wall of the bag on a first transverse fold line and overlying the end flaps, and a second side closure flap folded in from said one wall of the bag on a second transverse fold line and overlying and pasted to the first side closure flap, a triangular portion of said one end flap being folded over with the first side closure flap on a line which extends at an angle to said first transverse fold line, a trapezoidal portion of said one end flap being folded 'over with the second side closure flap on a line which extends at. an angle to said sure at one end thereof, one of the corners of the bagat.

said end thereof being a valve corner,"s aid closure being constituted by inturned end flaps, the one end flap at said valve corner being formed by folding the walls of theba'g on lines extending at an angle to one another froni apex on the side edge of the bag, a first side closure flap folded in from one wall of the bag on a' first transverse fold line and overlying the end flaps, and a second side closure flap folded in from the other wall of the bag on a second transverse fold line and'overlying and pasted to the first side closure flap, a triangular portion of said one end flap being folded over with the first side closure flap on a line which extends from the valve corner end of said first transverse line at an angle to said first tr'an s-' verse line and located inward of said first transverse line, another portion of said one end flap being folded over with said second side closure flap on a line which extends from the valve corner end of said second transverse line at an angle to said second transverse line and located inward of said second transverse line, said lines on which said portions are folded over converging toward one another from the valve corner ends of said transverse fold lines so that the inner end of the valve is narrower than the width of the closure, and triangular portions of said one end flap being folded outward into the planes of the side closure flaps.

3. A paper valve bag as set forth in claim 2 wherein the said portion of said one end flap which is folded over with said second side closure flap is a triangular portion of said one end flap.

References Cited in the file of this patent UNITED STATES PATENTS 1,853,105 Weisshuhn Apr. 12, 1932 2,201,675 Jorgensen May 21, 1940 2,360,720 Robinson Oct. 17, 1944 2,668,003 Jones Feb. 2, 1954 FOREIGN PATENTS 528,596 Great Britain Nov. 1, 1940 

